---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.ts
---
# Input
```ts
class X0 {
	static foo = false;
	static bar() { }
}

class X1 {
	static #foo = false;
	static bar() {}
}

const X2 = class {
	static foo = false;
};

const X3 = class A {
	static foo = false;
};

export default class {
	static foo = false;
}

class StaticConstants0 {
	static readonly version = 42;

	static isProduction() {
		return Math.random() > 0.5;
	}
}

```

# Diagnostics
```
invalid.ts:1:1 lint/complexity/noStaticOnlyClass ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Avoid classes that contain only static members.
  
  > 1 │ class X0 {
      │ ^^^^^^^^^^
  > 2 │ 	static foo = false;
  > 3 │ 	static bar() { }
  > 4 │ }
      │ ^
    5 │ 
    6 │ class X1 {
  
  i Prefer using simple functions instead of classes with only static members.
  

```

```
invalid.ts:6:1 lint/complexity/noStaticOnlyClass ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Avoid classes that contain only static members.
  
     4 │ }
     5 │ 
   > 6 │ class X1 {
       │ ^^^^^^^^^^
   > 7 │ 	static #foo = false;
   > 8 │ 	static bar() {}
   > 9 │ }
       │ ^
    10 │ 
    11 │ const X2 = class {
  
  i Prefer using simple functions instead of classes with only static members.
  

```

```
invalid.ts:11:12 lint/complexity/noStaticOnlyClass ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Avoid classes that contain only static members.
  
     9 │ }
    10 │ 
  > 11 │ const X2 = class {
       │            ^^^^^^^
  > 12 │ 	static foo = false;
  > 13 │ };
       │ ^
    14 │ 
    15 │ const X3 = class A {
  
  i Prefer using simple functions instead of classes with only static members.
  

```

```
invalid.ts:15:12 lint/complexity/noStaticOnlyClass ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Avoid classes that contain only static members.
  
    13 │ };
    14 │ 
  > 15 │ const X3 = class A {
       │            ^^^^^^^^^
  > 16 │ 	static foo = false;
  > 17 │ };
       │ ^
    18 │ 
    19 │ export default class {
  
  i Prefer using simple functions instead of classes with only static members.
  

```

```
invalid.ts:19:16 lint/complexity/noStaticOnlyClass ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Avoid classes that contain only static members.
  
    17 │ };
    18 │ 
  > 19 │ export default class {
       │                ^^^^^^^
  > 20 │ 	static foo = false;
  > 21 │ }
       │ ^
    22 │ 
    23 │ class StaticConstants0 {
  
  i Prefer using simple functions instead of classes with only static members.
  

```

```
invalid.ts:23:1 lint/complexity/noStaticOnlyClass ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Avoid classes that contain only static members.
  
    21 │ }
    22 │ 
  > 23 │ class StaticConstants0 {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^
  > 24 │ 	static readonly version = 42;
  > 25 │ 
  > 26 │ 	static isProduction() {
  > 27 │ 		return Math.random() > 0.5;
  > 28 │ 	}
  > 29 │ }
       │ ^
    30 │ 
  
  i Prefer using simple functions instead of classes with only static members.
  

```